White spirit or any of the fakes, meths, alcohol, Tar remover/label remover (same stuff usually), petrol, lighter fluid, proper automotive thinners (will probably destroy the finish of the fridge!) acetone (same warning) nail varnish remover will all do the job. Wouldn't bother with WD40, it's not anywhere near as strong as the aforementioned and will leave a residue that will itself need cleaning up. (So will nail varnish remover if it's got any kind of additives like moisturisers and other girly crap)
I use nail varnish remover at work because we sell it and it does the job, but it's such a watered down product it takes forever! Keep threatening to bring in my automotive thinners and gas everyone out of the building...